package com.itheima.reggie.filter;
import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {
    public static final AntPathMatcher PATH_MATCHER=new AntPathMatcher();
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

//        A. 获取本次请求的URI
        String uri = request.getRequestURI();
        log.info("拦截到:{}",uri);
//        B. 判断本次请求, 是否需要登录, 才可以访问

        String[] url=new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg",
                "/user/login"
        };
        boolean check = check(url, uri);


//        C. 如果不需要，则直接放行
        if (check){
            filterChain.doFilter(request,response);
            return;
        }

//        D. 判断登录状态，如果已登录，则直接放行
        if (request.getSession().getAttribute("employee")!=null){
            Long id= (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(id);
            filterChain.doFilter(request,response);
            return;
        }

//        E. 如果未登录, 则返回未登录结果

        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;

    }

    public boolean check(String[] s,String RequestURI){

        for (String t : s) {
            boolean match = PATH_MATCHER.match(t, RequestURI);
            if (match){
                return true;
            }
        }
            return false;
    }

}
